536 Genus IIaeinaphi/f<alis 



Haemaphysalis leachi'. 



Mr Charles P. Lonnsbury, Union Entomologist, South Africa, was 

 the first to raise this tick oxpcrinicntally and to demonstrate that it 

 transmits canine piroplasmosis in Africa. 'Vho. piotocols of his experi- 

 ments (1901, pp. 5-(); 1902, pp. 5-7; 1904, pp. 27-29) give the main 

 points in the life-history of the species. From his brief statements 

 regarding the tick, the following (iata are abstracted : 



H. leachi is a three-host tick. The larvae and nymphs may drop off 

 gorged from the host as early as 48 hours after being put on. The 

 female remains upon the host for 9 days (minimum) to 12-15 days. 

 The time required for metamorphosis from egg to larva is 30-46 daj-s 

 in summer and 80-110 days in wintei'; the nymph emerges from the 

 larval skin in 10-12 days in sunniier ; the adult emerges from the 

 nvmphal skin in 18-20 days in summer and 70-105 days in winter. 

 A female laid 4200 eggs. The males remain upon the host for many 

 weeks, they release their hold upon the skin of the host and seek the 

 females. By using an incubator he hastened the process of meta- 

 morpho.sis so that he was able to raise three generations in a year. 

 The tick abandons the dying host. 



The following records relate (a) to ticks received in 1902-1906 from 

 -Mr Lounsbury, Cape Colony, S. Africa (they were used for infection of 

 dogs with Piroplasma canis), and (6) to ticks received 23. ill. 1912 from 

 -Ml- li. E. Montgomery, Nairobi, B. E. Africa. The last named were 

 the progeny (larval stage) of two replete females collected beneath a 

 box in which a jackal liad been kept. The first and second generations 

 raised in the laborat<jiy are numbered respectively 1737 I and 1737 II. 



The time H. leachi remains upon the host. 



Number of 

 Uost main- gorged ticks 



1 Reprinted, with shght c-hanges and additions, from Nnttall, iv. 1913, pp. 93-99. 



